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Product Warranty Reserve (Details) (Warranty Reserves [Member], USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Warranty Reserves [Member]
   
Rollforward of the product warranty reserve [Abstract]    
Balance at the beginning of period $ 824 $ 536
Additions charged to income 769 1,968
Warranty usage (401) (1,467)
Currency translation (3) (213)
End of period balance $ 1,189 $ 824